Laars heating systems, Page 22 – LAARS Mighty Therm2 MT2V (Sizes 500–2000 MBTU/h) - Install and Operating Manual User Manual
Page 22
LAARS Heating Systems
Page 22
Figure 18. Mighty Therm2 (1250–2000) Wiring Diagram.
Figure 17. Mighty Therm2 (1000) Wiring Diagram.
35 67
T'stat
35 67
T'stat
35 67
T'stat
35 67
T'stat
STAGE 1
STAGE 2
LOCAL/REMOTE
DPDT SWITCH
STAGE 1
STAGE 2
STAGE 1
SWITCH
SELECT
PUMP
L1
TB1-1
MANUAL
RESET
HIGH LIMIT
POLE 6
POLE 5
TERMINAL
BLOCK 1
BD #2
IGN
BD #1
IGN
IGN
BD #2
IGN
IGN
BD #1
IGN
BD #1
IGN
BD #2
IGN
BD #2
IGN
BD #1
IGN
LIGHT
10
GAS
HIGH
GAS
8
2
PUMP
IGN
BD #1
IGN
BD #2
IGN BD #2
BD #1
IGN
DRY CONTACT
ALARM
ALARM
SILENCE
BELL
IGN BD #2
L.O.
L.O.(G)
L.O.
BD #1
IGN
L.O.(G)
1
P2
P1
1
2
Delay on Break
Relay
Initiate
9
stage 2
stage 1
Gas Valve
Gas Valve
IGN
BD #1
IGN
BD #2
6
Press
35 67
Press
35 67
#2
of Fan
Proof
of Fan
#1
4
3
Interlock
Field
Gas
35 67
Gas
35 67
IGN
BD #2
IGN
BD #1
IGN
BD #1
BD #2
IGN
24V
35 67
24V
35 67
GND
35 67
GND
35 67
BLOCK
AUTO RESET
HIGH LIMIT
OPTIONAL
LOW
24 VAC
120 VAC
BLOWER 2
BLOWER 1
LOW
HIGH
LOW
HIGH
K1
K2
K1
K2
F2
35 67
F2
35 67
F1
35 67
F1
35 67
K3
HSI #2
HSI #1
120 VAC
DPDT
MAIN
POWER
SWITCH
S2
S2
35 67
35 67
L2
35 67
L2
35 67
BD #1
IGN
S1
S1
35 67
35 67
35 67
L1
35 67
JUMPER
N1
INPUT STAGE 1
STAGE 1
INPUT STAGE 2
STAGE 2
FLOW
SWITCH
5
SWITCH
SELECT
PUMP
L1
TB1-1
POLE 6
POLE 5
TERMINAL
BLOCK 1
BD #2
IGN
BD #1
IGN
BD #1
IGN
BD #2
IGN
BD #2
IGN
BD #1
IGN
BD #1
IGN
BD #2
IGN
BD #2
IGN
BD #1
IGN
LIGHT
FLUE
PUMP
IGN
BD #1
IGN
BD #2
DRY CONTACT
ALARM
R
LIGHT
ALARM
SILENCE
BELL
35 67
35 67
35 67
35 67
1
P2
P1
1
2
K2
K1
Delay on Break
Relay
Initiate
K3
9
7
stage 2
stage 1
Gas Valve
Gas Valve
IGN
BD #1
IGN
BD #2
6
Press
35 67
Press
35 67
#2
of Fan
Proof
Proof
4
3
Interlock
Field
Gas
35 67
Gas
35 67
IGN
BD #2
IGN
BD #1
IGN
BD #1
BD #2
IGN
24V
35 67
24V
35 67
GND
35 67
GND
35 67
24 VAC
120 VAC
BLOWER 2
BLOWER 1
LOW
HIGH
LOW
HIGH
K1
K2
K1
K2
F2
35 67
F2
35 67
F1
35 67
F1
35 67
K3
HSI #2
HSI #1
120 VAC
DPDT
MAIN
POWER
SWITCH
S2
S2
35 67
35 67
L2
35 67
L2
35 67
BD #2
IGN
BD #1
IGN
S1
S1
35 67
35 67
35 67
L1
35 67
JUMPER
N1
TO
PUMP
TO
PUMP
L1
STAGE 2
H2329000D